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Out of the estimated 1.1 million people living with HIV in the United States, roughly 20 percent are unaware they have the infection, according to the Centers for Disease Control and Prevention.

Since today is World AIDS Day, stay in the know by checking out the top testing options that are available to you. (Want more up-to-the-minute health news? Sign up for the Men's Health Daily Dose newsletter now!)

Enzyme Immunoassay (EIA) Test

The most common form of testing, the EIA requires a sample of your blood, oral fluids, or urine to detect HIV antibodies within your system. The test can be performed at your local health department, public health clinics, or your doctor's office. The results typically take up to two weeks.

Rapid HIV Antibody Tests

Similar to the EIA test, this too uses blood, oral fluid, or urine to detect HIV antibodies. The only difference? Your results are ready in 10 to 20 minutes.

Home Testing Kits

The Home Access HIV-1 Test System--currently the only testing kit approved by the Food and Drug Administration--allows you to get results from the privacy of your own home. How it works: Collect a sample of blood by sticking your finger with the sterile lancet provided. Dab the blood on the special collection card that comes with the kit. Send the sample back to the lab for testing, and then call the lab to retrieve your results.

To see where the convenient HIV testing spots are in your town, check out the CDC's HIV/AIDS Prevention and Service Provider Locator and simply type in your ZIP code.

AIDS isn't the only STD you need to worry about. Click here to learn The New Super-STD You Must Avoid.

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